package com.app.system.config.jwt;

import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by WCF on 2020/5/10.
 */
@SuppressWarnings("all")
public class JwtFilter extends BasicHttpAuthenticationFilter {

    private String tokeName = "authorization";//与systemParam.properties 中tokeName保持一致

    /**
     * 执行登录认证
     *
     * @param request     ServletRequest
     * @param response    ServletResponse
     * @param mappedValue mappedValue
     * @return 是否成功
     */
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        HttpServletRequest req = (HttpServletRequest) request;
        String token = req.getHeader(tokeName);
        if (token != null) {
            Subject subject = getSubject(request, response);
            try {
                subject.login(new JwtToken(token));
            } catch (Exception e) {
                return false;
            }
            return true;
        }
        return true;
    }

    /**
     * 对跨域提供支持
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest req = (HttpServletRequest) request;
        String token = req.getHeader(tokeName);
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个 option请求，这里我们给 option请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }
}
